What is the maximum allowable fuel imbalance before a CASS message appears?

The maximum allowable fuel imbalance before a CASS (Centralized Aircraft System Status) message appears is 790 lbs. This limitation is critical for ensuring aircraft performance and safety, as excessive fuel imbalances can affect the aircraft's balance, handling characteristics, and overall stability during flight.

When the imbalance exceeds 790 lbs, the CASS system triggers a warning to alert the flight crew. This is a designed operational limit that helps pilots manage fuel distribution more effectively, ensuring both the safety and efficiency of the aircraft. Operating within this limit is vital to maintain the desired center of gravity and to prevent potential adverse effects during various phases of flight.